Method of producing serrated edge



J. E. BURNS.

METHOD OF PRODUCING SERRATED EDGE.

APPLICATION FILED MAY 14. 1919.

1 A3 5, 5 1 4 Q Patented Nov 14, 1922?.

Patented Nov. 14, 1922.

mu s'r 'ras v i,a5,s14 PATENT. OFFICE.

JOSEPH E. BURNS, OF SYRACUSE, NEW YQRK.

METHOD OF PRODUCING SERRATED EDGE.

Application filed may 14,

I To all whom it may concern:

' scription.

This invention relates to certain improve;

' ments in method and apparatus for serrating.

edge tools and to certain .of the tools as V products.

' wheel should be of a width equal to the length of the cutting edge to be serratedwhereby the entire edge may be umformly' The object of the invention is to produce an eificient, relatively inexpensive and simple method of producing serrations 1n the blade portion of edge tools \by grinding .therein aseries of substantially regularly spaced grooves, thereby forming alternate recesses and projections in the blade to constitute the cutting edge thereof. .So far as I am aware such a resu t has never been effected through the use of a grinding tool or wheel. a

-For this purpose, the wheel is formed with a series of substantially parallel circumferential alternate grooves and ridges upon its periphery of suitable form, size and shape to produce the character ofse'rration desired. V

By the use of such a. grinding wheel a plurality of serrations may be slmultaneously produced and preferably the grooved serrated at a single operation.

- Other objects and advantages Wlll appear from the following description taken in corinection with the accompanying drawings in Fig. 1 is a view of an apparatus for carrying out my invention, illustrating a mowing the blade;

Fig. 3 is a view of a similar knife having the alternate grooves and ridges produced upon the inclined beveled surface. I I v Fig. 4: is a view of a butcher knife havlng its edge serrated by the method of this invention.

Fig. 5 is a view ofa pair.of shears having.

1919. Serial No. 296,995.

its cutting edges serrated by the method of this i vention.

As illustrative of one application of my invention, I have shown a mowing machine knife -1 of usual form and shape and having its edge provided with a plurality of serrations formed by grinding a plurality of spaced grooves in portions adjacent the edge thereof.- These grooves may perhaps preferably be formed in the lower flat ,face of the knife so that subsequent grinding of the beveled inclined surface -2 will not destroy or partially destroy the grooves and ridges but 'onthe other hand subsequent grinding will, merely reform the serrations which continue tobe of substantially uniform size and shape.

In Fig. 1 I have illustrated a grinding wheel of a width suitable for forming such grooves and ridges'upon the knife blade at a single operation. This wheel 3- is formed of a suitable abrasive for the purpose in hand and is preferably an aluminum oxide material. The periphery of the wheel is formed with a series of alternate coves and ridges, such grooves being ormed therein in any suitable manner to.

provide a plurality of substantially parallel circumferential cutting edges 4 adapted to form the grooves in the cutting edge of the tool, as for instance, the knife, theshears, or other edge tools. The wheel 3 ma be mounted 1n any suitable manner. and have shown.it as rotatably supported in frame work 5- and adapted to be power driven by pulley -6-. By the use of such .a wheel serrations of desired form and size may be producedto produce a highly efficient cutting edge. Although preferably the wheel-is of the width at least equal to the width of the edge to beserrated, :such a construction is not essential and I do not desire to limit myself to any specific. size of wheel. By merely holding the edge portion of the tool to be ground in contact with the grinding wheel, the alternate grooves and ridges will be formed to provide the serrated edge.

- Although I have shown and described particularlapparatus and particular edged tools as adapted to be serrated by said apparatus, I do not desire to limit myself to any particular form, size or shape of apparatus or to specific'edged tools except w ere the same may be specifically set forth in' detail in the claims hereto appended.

What I claim is 1. The method of forming a. serrated edge upon a cutting blade, comprising bringing one side of said cut-ting blade into contact with an, abrasive wheel having upon its surface a plurality of circumferential substantially parallel uniform ridges spaced by narrow grooves, while the Wheel is rotating and maintaining such contact to simultaneously form upon said blade a plurality of relatively fine uniformly spaced, accurately shaped, substantially V shaped grooves, deepening toward the edge of the blade, and intersecting and breaking the continuity of the edge of said blade, and determining a plurality of substantially similar V-shaped teeth.

2. The method of forming a serrated edge upon a cutting blade comprising shaping an integral grinding wheel With a plurality of circumferential substantially parallel uniform ridges spaced by narrow grooves, and bringing one side of said cutting blade into contact with said wheel, while the latter is rotating, to simultaneously form upon said blade a plurality of laterally extending relatively fine uniformly spaced accurately shaped substantially V-shaped rooves intersecting and breaking the contlnuity of ,the edge of said blade, and determinin a plurality of substantially similar -shaped teeth. a

In witness whereof I have hereunto set my hand this 6th day of May 1919.

' JOSEPH E. BURNS. Witnesses;

H. E. CHASE, E. A. THOMPSON. 

